Resin is the heart and soul of every properly functioning water softener. Softener resin works hard to remove harsh minerals from your water such as calcium, magnesium and iron. Water softener resin should be replaced when any of the following occur:
Types of Resin
Resin is usually defined by the individual bead size (mesh) and the hardness (cross-link percentage). Harder resins are more desirable in most applications as they allow for more softening capacity and better fouling resistance.